Handy-Trady Hire (HTH) is a home repair company that employs several contractors who specialise in different areas. Contractors have a specialisation in any of the following areas: Electrical Cabinet...

Handy-Trady Hire (HTH) is a home repair company that employs several contractors who specialise in different areas. Contractors have a specialisation in any of the following areas:


Electrical


Cabinet making


Landscaping, plumbing


Driveway sealing


Roof cleaning


Interior & Exterior painting





HTH started as a small family business and for the past five years has been managing their business activities using an Excel spreadsheet. With view to their expanding business and under the new management, they decided to investigate the option of implementing a database system. Accordingly, they hired you to design a relational database to better track and record their operational data.





HTH discovered business rules/constraints for your ERD:





A.      A customer calls HTH to request a home repair job:
         Details about the customer and the requested job need to be recorded. (2 marks)



B.      Each tradesperson specialises in only one trade, and details of their trade and the date acquired need to be kept on record. (2 marks)





C.      HTH has several trucks (including equipment) and allocates a truck for each tradesperson to do a job. Although some tradespersons have their own truck and equipment and advise HTH about this, so not to be assigned a truck. (2 marks)



D.      A requested job may require different specialisation depending on the job type – that is, a job may require more than one tradesperson to complete. (4 marks